Cooling device for dynamos.



W. GSCHElDLEN.

COOLING DEVICE FOR DYNAMOS.

APPLICATION HLED DEC. 5, 1914.

' Patented Feb. 1, 1916.

UNITED STATES PATENT OFFICE.

WILHELM GSCHEIDLEN,

0F BERLIN-SCHMARGIENDORF, GERMANY, ASSIGNOR TO SIEMENS-SCHUCKERTWERKE G. M. B. H., OF BERLIN, GERMANY, A CORPORA- TION OI GERMANY.

COOLING DEVICE FOR DYNAMICS.

Specification of Letters Patent.

Patented Feb. 1, 1916.

T 0 all whom it may] concern Be it known that I, WILHELM Gscnnm- "LEN, a German citizen, and resident of Berlin-Schmargendorf, Germany, have invented certain new and useful Improvements in Cooling Devices for Dynamos, of which the following is a specification.

This invention relates to a novel Eidoling device for sliding contacts in dynamo electric machinery, that is for slip-rings or com mutators and their brushes and is especially of advantage in high-speed machinery such' as unipolar dynamos, turbo-generators and the like. In machinery of this kind the cooling of the sliding contacts becomes difiicult by reason of the air being prevented from having a proper access to the-parts to be cooled which is due to the centrifugal action caused by the high-speed of the dynamo.

My invention consists in brief in providing a casing around the sliding contact to be cooled, said casing surrounding said contact from all sides and conveying the cooling medium such as air in a path which is essentially concentrical to the axis or rotation of the dynamo. The brushes are led in through the casing to contact with the slip-rings or commutator. In the space thus provided between said casing and the surface of the commutator or slip-ring as the case may be the cooling medium or air will be kept together and may thus be carried in sufficient quantities to the points which shall be cooled- For supplying the cooling medium to and carrying the same away from the sliding contacts I employ nozzles which are mounted on said casing and project into the interior space thereof. These nozzles are properly constructed so that one may serve for the supply of the cooling medium and the other for its discharge. For instance the supply is so directed that it will give the proper direction of motion to the cooling medium, while the discharge nozzle is so constructed that it will properly catch up the cooling medium which is thrown away from the sliding surface in tangential direction, so

that the medium may discharge to the outside by suction effect.

In the drawings I have shown sections through a cooling device according to my invention, Figure 1 showing a cross section and Fig. 2 a longitudinal section.

a is the dynamo member to be cooled, for nstance a slip-ring, as shown in the drawmg, mounted upon the axle of a dynamo and b the casing surrounding said slip-ring at some distance therefrom and concentrically in such a manner that a circular, preferably cylindrical intermediate space 0 will be provided into which the cooling air is introduced by the nozzle 6 and from which it will be cischarged by a nozzle or similar device f. The cooling medium or air is introduced in the direction of rotation of the slip-ring a, so that the rotary motion itself will be utilized for imparting proper motion to the cooling air.

d are brushes which are led in through the casing b and contact with the slip-ring a.

The nozzle f is so constructed that it will be able to draw in the air from the space 0 and discharge the same toward the outside.

In the cooling device according to my invention the cooling medium, if the rotary motion of the slip-ring or commutator is not sufiicient for imparting the proper velocity thereto, may either be introduced under pressure into the nozzle 6 or sucked off by the nozzle 7.

The casing b may be tightened with the rotary part a if required by any known construction such as stufiing boxes or labyrinth packings. In general a limited lateral discharge for the cooling medium, especially if air is used as such will not be injurious. If a liquid, however, is employed for cooling more care must be taken for laterally closing the space between slip-ring and easing. If desired this closure may be effected preferably by a liquid and by having the rotary parts together with their casing arranged in a container which is filled with said liquid, so that all joints will be covered up by the same.

Having thus described my invention I projecting into the said space and being bent in opposite directions and about tangentially to said sliding surface, substantially as de- 15 scribed. In witness whereof I have hereunto set my signature in the presence of two subscribing witnesses.

WILHELM GSCHEIDLEN.

Witnesses HENRY HABPER, WOLDEMAR HAUPT. 

